def add(args):
    return sum(args)
    
def sub(args):
    ret = args[0]
    for i in args[1:]:
        ret -= i
    return ret
    
def mul(args):
    ret = args[0]
    for i in args[1:]:
        ret *= i
    return ret

def mul(args):
    ret = args[0]
    for i in args[1:]:
        ret *= i
    return ret
